In the opening chase of MM1 as Max closes on the Night Rider Max sounds his horn, The cadence is the horn cadence of the car in the movie 'The Car' James Brolin was in it. "The Car" (movie) was released about four years before the 1979 release of Mad Max. Miller watched car movies because he is a car guy. This may had been noticed before. If not give it a listen!

Not the sound or tone of the horn. The timing of it's manipulation A blast, a pause followed by three quick blasts. Are you familiar with the movie . 'The Car" I think it was 1976 and American actor James Brolin was in it. Movie about a car from hell. That was it's horn 'cadence'